package com.keson.guard.util;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class DownLoadUtil {
    /**
     * 从网络Url中下载文件
     * @param urlStr
     * @param saveFileName
     * @param savePath
     * @throws IOException
     */
    public static void  downLoadFromUrl(String urlStr,String saveFileName,String savePath) throws IOException{
        URL url = new URL(urlStr);
        HttpURLConnection conn = (HttpURLConnection)url.openConnection();
        //设置超时间为3秒
        //conn.setConnectTimeout(3*1000);
        //防止屏蔽程序抓取而返回403错误
        //conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");

        //得到输入流
        InputStream inputStream = conn.getInputStream();
        //获取自己数组
        byte[] getData = readInputStream(inputStream);

        File file;
        //文件保存位置
        if(!savePath.equals("")&&savePath!=null) {
            File saveDir = new File(savePath);
            if(!saveDir.exists()){
                saveDir.mkdir();
            }
            file = new File(savePath+"/"+saveFileName);
            if (file.exists()){
                file.delete();
            }
        }else {
            file = new File(saveFileName);
        }

        FileOutputStream fos = new FileOutputStream(file);
        fos.write(getData);
        if(fos!=null){
            fos.close();
        }
        if(inputStream!=null){
            inputStream.close();
        }
    }



    /**
     * 从输入流中获取字节数组
     * @param inputStream
     * @return
     * @throws IOException
     */
    public static  byte[] readInputStream(InputStream inputStream) throws IOException {
        byte[] buffer = new byte[1024];
        int len = 0;
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        while((len = inputStream.read(buffer)) != -1) {
            bos.write(buffer, 0, len);
        }
        bos.close();
        return bos.toByteArray();
    }

    public static void main(String[] args) {
        try{
            downLoadFromUrl("http://47.94.80.3:8070/contact/002.xls",
                    "phone.xls","");
        }catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
    }

    public static void  downLoadFromUrlBigSize(String urlStr,String saveFileName,String savePath) throws IOException{
        URL url = new URL(urlStr);
        HttpURLConnection conn = (HttpURLConnection)url.openConnection();
        //设置超时间为3秒
        //conn.setConnectTimeout(3*1000);
        //防止屏蔽程序抓取而返回403错误
        //conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");

        //得到输入流
        InputStream inputStream = conn.getInputStream();
        int length = conn.getContentLength();
        File file;
        //文件保存位置
        if(!savePath.equals("")&&savePath!=null) {
            File saveDir = new File(savePath);
            if(!saveDir.exists()){
                saveDir.mkdir();
            }
            file = new File(savePath+"/"+saveFileName);
            if (file.exists()){
                file.delete();
            }
        }else {
            file = new File(saveFileName);
        }

        FileOutputStream fos = new FileOutputStream(file);

        byte[] buffer = new byte[1024];
        int len = 0;
        int count = 0;
        int i = 0;
        while((len = inputStream.read(buffer)) != -1) {
            fos.write(buffer, 0, len);
            count += len;
            i++;
            if(i==10000||count>=length){
                i=0;
//                LogUtil.info("大文件下载","已下载"+((float)count/length)*100+"%");
            }
        }

        if(fos!=null){
            fos.close();
        }
        if(inputStream!=null){
            inputStream.close();
        }
    }
}
